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Old 04-14-2018, 05:23 PM   #1
zixaq
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New Ticking noise: synced to RMP, only under load when engine warm

Ugh. Feels like I can't catch a break on this bike. I just got my electrical gremlins sorted (faulty kill switch!), and now there's something coming from the engine.

It doesn't do the sound at idle, or even revving on the center stand, so I can't do the ear-to-screwdriver trick to locate it.

Only happens after the bike is good and warm, accelerating, and it's a fast ticking that matches RPM. Seems to be worse at low (4-6k) RPM, but that could just be fading against wind noise at speed.

Possibilities I know of: Cam Chain Tensioner (manual one on the way, will replace anyway), Valve train problem? (I adjusted the valves about a thousand miles ago, so it's possible something went wrong), Exhaust leak?

Any ideas of other things?

Should I just take it to someone who knows what they're doing?
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Old 04-14-2018, 05:26 PM   #2
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Ugh. Should I just take it to someone who knows what they're doing?
That's crazy talk.
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Old 04-16-2018, 09:07 AM   #3
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Are you currently putting in the highest octane gasoline?

If not, maybe it's detonation.
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Old 04-17-2018, 01:50 PM   #4
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Are you currently putting in the highest octane gasoline?

If not, maybe it's detonation.
That would be . . . extremely weird . . . for this bike. But I'll try out premium next time I fill up just in case.

I replaced the cam chain tensioner today. We'll see if it makes a difference tomorrow.
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Old 04-17-2018, 06:51 PM   #5
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To troubleshoot an internal noise the first step is to establish the
rate at which it occurs... is the noise in time with the camshaft or
crankshaft??? camshafts rotate 1/2 the speed of the crankshaft...
possible source of camshaft speed noises are shim and bucket
clearances... loose cam bearing blocks... broken valve springs...
possible source of crankshaft speed noises are a scuffed piston...
stuck piston ring... rod bearings...

To pin point the exact location of the noise hold a long tip screw driver or a
length of garden hose up to your ear and probe the suspected area...
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Old 04-18-2018, 08:22 AM   #6
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I literally had these exact same symptoms and was about to go in and change the CCT and timing chain. However, right before doing that, I decided to take it out for a ride one more time to hear it again, but this time stuck my foot on the exhaust heat shield when the sound came on and it instantly went away. Removed the heat shield completely, rode, and the noise went away with the heat shield. Turns out there was a fiber washer between the pipe and shield that is supposed to prevent this, but mine was missing. They tend wear out and fall off over time. Might be worth a look.

Mine too was only under load and within a certain rpm range.
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Old 04-18-2018, 08:56 AM   #7
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Check the exhaust header bolts. They can get loose and give the exact symptoms you describe.

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Old 04-18-2018, 06:15 PM   #8
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I literally had these exact same symptoms and was about to go in and change the CCT and timing chain. However, right before doing that, I decided to take it out for a ride one more time to hear it again, but this time stuck my foot on the exhaust heat shield when the sound came on and it instantly went away. Removed the heat shield completely, rode, and the noise went away with the heat shield. Turns out there was a fiber washer between the pipe and shield that is supposed to prevent this, but mine was missing. They tend wear out and fall off over time. Might be worth a look.

Mine too was only under load and within a certain rpm range.
Quote:
Originally Posted by Maddevill View Post
Check the exhaust header bolts. They can get loose and give the exact symptoms you describe.

Mad
Thanks, guys, I'll be checking the exhaust next. If that doesn't do it, I'm pulling the head cover off again to make sure the clearances are right and everything's tight.

CCT made no noticeable change in the noise.

I actually took it to a mechanic yesterday and asked if he could diagnose it and what it would cost to fix. He just shrugged and said he didn't know and didn't seem to want to take it.
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Old 04-22-2018, 07:46 AM   #9
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Check the exhaust header bolts. They can get loose and give the exact symptoms you describe.

Mad
This. I know somebody who experienced the same - suspected the cams but it ended up being missing fiber washer for exhaust heat shield.
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Old 04-24-2018, 11:21 AM   #10
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Have you checked your drive chain tension?
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Old 04-24-2018, 06:46 PM   #11
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Have you checked your drive chain tension?
Yes, it's right on spec.

Still waiting on gaskets so I can put my exhaust back on and try it out. The header gaskets and bolts all seemed okay. There was some wear on the header-to-cat pipe gasket, but I'm not sure if something that far from the engine could cause this kind of issue?
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Old 04-25-2018, 01:10 PM   #12
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Yes, it's right on spec.

Still waiting on gaskets so I can put my exhaust back on and try it out. The header gaskets and bolts all seemed okay. There was some wear on the header-to-cat pipe gasket, but I'm not sure if something that far from the engine could cause this kind of issue?
Yes, Anywhere exhaust can leak out can cause a click sound as the pulses exit through the leak.

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Old 04-27-2018, 05:21 PM   #13
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My engine exploded today.

Re-mounted the exhaust with new studs/gaskets/nuts and took it out for a test ride. First attempt at hard acceleration to replicate noise and something blew a 2" hole in the front of my crankcase.

On the positive side, at least I have a good idea now where the problem was coming from, although I still don't know exactly what or why. On the downside, I have two months to find a new bike or a new motor to ride across the country.
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Old 04-27-2018, 05:33 PM   #14
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My engine exploded today.
I don't think you can claim to be an experience rider until you've blown up an engine or two. Welcome to the club.
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Old 04-27-2018, 08:03 PM   #15
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Pics of the new engine case vent hole?
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